The International Space Station mainly uses solar power, but it is not in direct sunlight all the time, so other power sources must be used. It relies on rechargeable lithium-ion batteries to provide power one third of the station’s orbit. In 2017, lithium-ion batteries replaced the nickel-hydrogen batteries. But it was Olga D. Gonzalez-Sanabria whose technical contributions helped to develop the "Long Cycle-Life Nickel-Hydrogen Batteries" in the 1980s and enable the International Space Station to always have power to sustain life-support systems and experiments.